At the end of the day, AFAIK, the focal length of a lens is EXACTLY the same, no matter what the size of the sensor is. A 50mm lense is a 50mm lens on a 35mm or full frame camera, but while it is a standard lens on a 35mm camera, it is a telephoto lens on a APSC camera.
It might be nice to have the 35mm equivalent printed printed on a Canon EF-S lens, for example, but if you moved from 35mm to medium format, would you expect the same information on a medium format camera lens?
At the end of the day, doing the math isn't that hard.
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